Metal

摘要： Metal pollution has become an major issue governing the wetland ecosystem health.The southern coastal wetland of the Qiangtang Estuary are facing unusual perturbation due to rapid development along the embayment in recent decades.This study evaluated the bioavailability of metals(Cu,Pb,Cd,Cr and Zn)in the sediment of the southern coastal wetland of the Qiangtang Es-tuary using diffusive gradients in thin films(DGT)techniques and compared with several methods based on total metal content.The results showed that the contents of Cr,Pb,Cd and Cu in sediment,as detected using DGT,were considerably correlated with the exchangeable fraction and the content in Phragmites australis roots,while a weak correlation was observed for Zn.Therefore,DGT analysis could be used to evaluate the bioavailability and potential risk of Cr,Cd,Pb and Cu for P.australis.Quantitative indices,such as DGT concentration,bioaccumulation in P.australis,geoaccumulation index(Igeo)and potential ecological risk index(RI),revealed that Cd was a major potential ecological risk factor along the southern coast wetland of the Qiantang Estuary,especially in the upstream region,which is potentially more vulnerable to the anthropogenic pollution.

摘要： 真实感图形学就是利用光照、阴影及物体之间的交互模拟出一个真实的虚拟世界。渲染(Rendering)是图形学的研究重点,它是根据着色器、纹理等提供的数据信息通过信息处理的方式所生成的矢量图像,依据渲染方式的不同可分为实时渲染和离线渲染,文章将实时渲染中实时性和离线渲染中光线追踪算法结合起来,并使用Metal图形API实现了一个全局光照模型,最终达到了高精度且实时的渲染效果。

摘要： Some metal elements,especially trace elements,have obvious nutritional and physiological functions on the human body,which can promote the growth and development of the body,regulate the function of the body and maintain the metabolism of the human body.Compared with the elements in the form of inorganic salts,metal chelating peptides are more easily absorbed by the human body.Metal chelating peptides efficiently provide various trace elements necessary for life activities,have antioxidant,antibacterial and other biological activities,and have broad application prospects in food,medicine,cosmetics and other fields.In this paper,the methods of preparation,separation and purification of metal chelating peptides from animals and plants were reviewed,the structure-activity relationship and antioxidant activity of metal chelating peptides were analyzed,and the development prospect of metal chelating peptides was prospected.

摘要： Adsorption of heavy metal ions on chitosan-based adsorbents has been extensively investigated.However,few studies explored the feasibility of desorbing and regenerating chitosan.Adsorbents used after adsorption of heavy metals are discarded,and this practice exacerbates the solid treatment problem.Regeneration and reuse of exhausted adsorbents should be considered to operate environment-friendly and cost-effective adsorption.This review was performed to summarize the desorption of heavy metal ions and possible regeneration of chitosan-based adsorbents using various desorption agents such as acids,alkalis,salts,and chelating agents.It was found that the highest desorption efficiencies were obtained by acidic eluents.The percentage use of desorption agents for desorbing followed the order of acids(49.3%)>chelators(26.9%)>alkalis(14.9%)>salts(8.9%).Moreover,the proper desorption time was estimated to be 0.84 by 1.37 h.The beneficial information is provided for the regeneration and recovery of chitosan adsorbents.

摘要： As an important class of inorganic-organic hybrid materials, metal phosphonates can exhibit versatile structures, interesting functions and high water and thermal stabilities. Despite a large number of metal phosphonates reported in the past two decades,the development of chiral metal phosphonates is still in its infancy. This review summarizes the current status in this topical field including the synthetic strategies, the crystal structures of chiral metal phosphonates reported thus far, and their physical and chemical properties. Future challenges in this promising field are also discussed.

摘要： Malignant gastric outlet obstruction(MGOO)is a clinical condition characterized by the mechanical obstruction of the pylorus or the duodenum due to tumor compression/infiltration,with consequent reduction or impossibility of an adequate oral intake.MGOO is mainly secondary to advanced pancreatic or gastric cancers,and significantly impacts on patients’survival and quality of life.Patients suffering from this condition often present with intractable vomiting and severe malnutrition,which further compromise therapeutic chances.Currently,palliative strategies are based primarily on surgical gastrojejunostomy and endoscopic enteral stenting with self-expanding metal stents.Several studies have shown that surgical approach has the advantage of a more durable relief of symptoms and the need of fewer re-interventions,at the cost of higher procedure-related risks and longer hospital stay.On the other hand,enteral stenting provides rapid clinical improvement,but have the limit of higher stent dysfunction rate due to tumor ingrowth and a subsequent need of frequent reinterventions.Recently,a third way has come from interventional endoscopic ultrasound,through the development of endoscopic ultrasound-guided gastroenterostomy technique with lumen-apposing metal stent.This new technique may ideally encompass the minimal invasiveness of an endoscopic procedure and the long-lasting effect of the surgical gastrojejunostomy,and brought encouraging results so far,even if prospective comparative trial are still lacking.In this Review,we described technical aspects and clinical outcomes of the above-cited therapeutic approaches,and discussed the open questions about the current management of MGOO.

摘要： Melatonin,as a ubiquitous indoleamine hormone,is synthesized primarily by the pineal gland.It has diverse biological effects through quite complex mechanisms.More recently,studies have focused on the mechanism of melatonin in anti-reproductive toxicity/damage.Since melatonin possesses strong antioxidant and anti-apoptotic properties,researchers have examined its potential role in protecting against male reproductive toxicity/damage,which may be induced by chemotherapy or environmental toxicants and can lead to male infertility.In this article,recent progress regarding the protective effects of melatonin on male reproductive toxicity/damage is reviewed.

摘要： The distinguished electronic and optical properties of lead halide perovskites(LHPs)make them good candidates for active layer in optoelectronic devices.Integrating LHPs and two-dimensional(2 D)transition metal dichalcogenides(TMDs)provides opportunities for achieving increased performance in heterostructured LHPs/TMDs based optoelectronic devices.The electronic structures of LHPs/TMDs heterostructures,such as the band offsets and interfacial interaction,are of fundamental and technological interest.Here CsPbBr3 and MoSe2 are taken as prototypes of LHPs and 2 D TMDs to investigate the band alignment and interfacial coupling between them.Our GGA-PBE and HSE06 calculations reveal an intrinsic type-II band alignment between CsPbBr3 and MoSe2.This type-II band alignment suggests that the performance of CsPbBr3-based photodetectors can be improved by incorporating MoSe2 monolayer.Furthermore,the absence of deep defect states at CsPbBr3/MoSe2 interfaces is also beneficial to the better performance of photodetectors based on CsPbBr3/MoSe2 heterostructure.This work not only offers insights into the improved performance of photodetectors based on LHPs/TMDs heterostructures but it also provides guidelines for designing high-efficiency optoelectronic devices based on LHPs/TMDs heterostructures.

摘要： The sanitary and environmental challenges posed by an ever growing economically and geographically diverse human population include the need for sustainable, inexpensive, scalable, and decentralized water treatment technologies that can supplement or replace conventional treatment methods. These challenges can be met by semiconductor photocatalysis, especially if the process is driven by visible light energy. Visible-light active (VLA) photocatalysis, as opposed to traditional energy-intensive and chemically driven disinfection methods such as ozonation, UV irradiation and chlorination, has the potential for achieving high disinfection efficiency with low energy consumption and no harmful by-products. This technology generates in-situ reactive oxygen species (ROS) such as H2O2, and?, without the need for chemicals addition. In turn, ROS are capable of penetrating cell walls and membranes of microorganisms, effectively inactivating them. Although multiple types of VLA photocatalysts have been used experimentally for disinfection of water, noble-metal-based photocatalysts have gained the most interest due to their surface plasma resonance (SPR) effect, which acts synergistically to increase the disinfection potential of the photocatalytic process. This paper is a review of the different types of noble-metal-based VLA photocatalysts used for water disinfection in different experimental settings, their synthesis procedures and disinfection mechanisms. It also discusses innovative approaches to overcome a major hurdle in photocatalysis, that is, the rapid recombination of the electron and hole pair, by including specific dopants into the structure of the photocatalyst.

摘要： The manufacture by arc furnace technology of various fused metal oxides, such as for example fused zirconia, fused alumina-zirconia or brown fused and semi-friable alumina, affords furnace dusts as a byproduct. The present invention relates to investment casting moulds comprising the furnace dust, wherein said furnace dust comprises ZrO2 and/or Al2O3. The invention provides a way of recycling said furnace dusts. The present invention also provides investment casting moulds comprising a metal oxide dust comprising ZrO2 and one or more materials selected from alumina, silica and aluminosilicate, and wherein said metal oxide dust has a d50 of 10 μm or less. The invention also provides compositions for the production of investment casting moulds, the use of dusts in the formation of investment casting moulds, and the use of investment casting moulds of the invention. The investment casting moulds according to the present invention had improved or equivalent strength, and improved or better solids levels than those according to the state of the art. Furthermore, the formation process was quicker.

摘要： 一种键盘用杠杆及机械杠杆式METAL？DOME键盘，杠杆呈“Z”字形，包括按压位置、连接部位和杠杆结构，杠杆一端固定安装有按压位置，另一端固定安装有连接部位，杠杆结构上设有按压弹片结构，连接部位上开设有一个以上的固定杠杆结构孔，超薄键盘包括键帽、杠杆、固定膜、弹片、PCB以及底板，所述的底板上固定设有用于安装柱杠杆的安装柱，PCB设置在底板上，弹片设置在PCB上，固定膜设置在弹片上方，杠杆设置在固定膜上方，杠杆上的按压弹片结构对应于弹片设置，键帽安装在杠杆上方，且对应于杠杆上的按压位置设置。本发明整个产品轻、薄、简捷，安装、拆卸方便，而且手感好、携带方便。

摘要： 本发明实施例涉及一种解决金属填充Metal Fill而导致芯片时序恶化的方法。所述方法包括：在布局布线步骤中执行金属填充；确定金属填充后的芯片中各个时序路径(timing path)上各时序端点(timing endpoints)是否存在时间违例(time violation)；当存在时间违例时，确定所述时序路径为时序风险路径(timing critical path)；针对时序风险路径，以设定宽度生成虚拟阻挡层，并沿所述时序风险路径设置所述虚拟阻挡层，用以替代在所述虚拟阻挡层所占位置上的所述金属填充。

摘要： 本发明实施例涉及一种解决金属填充Meta l F i l l引起芯片时序恶化的方法。在布局布线步骤中，获取芯片中各个时序路径上各时序端点的建立时间和保持时间；根据芯片的时钟周期确定各个时序端点发生建立时间违例对应的第一违例时间和保持时间违例对应的第二违例时间；对每个时序路径确定各时序端点的建立时间与第一违例时间的时间间隔是否满足设定的时序裕度，以及对每个时序路径确定从建立时间起经过保持时间后的终止时间与第二违例时间的时间间隔是否满足设定的时序裕度；当存在任一不满足时，确定时序路径为时序风险路径，并以设定宽度生成虚拟阻挡层，沿时序风险路径设置虚拟阻挡层，用以后续在金属填充时阻挡在虚拟阻挡层所占位置上执行金属填充。

摘要： 本发明适用于集成电路领域，提供了一种便于多次Metal‑fix的集成电路版图构造方法，具体为：串接顶层Metal到底层Metal的所有层次至少两次，同时每个Metal层次上预留有满足断开连接关系的宽度。本发明方法得到的集成电路版图结构，能支持同一节点上多次修改，并能尽可能减少修改层次，值得推广。

摘要： 一种基于Metal Mesh网格图案设计的触控显示屏，该触控显示屏包括触摸屏、第二粘接剂以及液晶显示模组，触摸屏包括电容层、第一粘接剂以及盖板，电容层包括sensor基材、电容感应层以及电容驱动层，电容感应层镀设于sensor基材的一端面上，电动驱动层镀设于sensor基材远离电容感应层的端面上，盖板通过第一粘接剂粘接于电容层的一端面上，液晶显示模组通过第二粘接剂粘接于触控屏远离盖板的端面上，本发明使面内金属网格线宽由常规的4um～5um降低至2um，使边缘走线的线宽线距由常规的15um/15um降低至10um/10um，提供触控显示屏的屏占比，实现超窄超细的目的，同时优化面内网格图案设计，使网格节点增加至常规Metal Mesh网格图案设计的节点数的2.5倍，降低功能失效风险，提高制程良率。

摘要： 本发明公开一种Metal Mesh网格节点的补偿设计方法，确定网格线宽，获取设计值与实际值的差值a‑b；根据网格节点中各交叉线的角度β，确定网格交叉点的节点形成的第一几何图形；以第一几何图形的对称中心为坐标原点建立坐标系，根据设计值与实际值的差值a‑b的大小，建立边长为b/sinβ或a/sinβ的第二几何图形，穿过坐标原点连接第二几何图形的四个顶点形成对角线；在坐标系的一个象限内的对角线上确立节点，确立网格线边缘的过渡点，连接节点以及过渡点，形成线段，单向延长线段，与网格补偿前的设计线段相交，产生交点，形成网格节点的补偿设计。本发明改善网格节点偏差问题，避免屏幕闪点，改善视觉效果。

摘要： 一种负载超小贵金属粒子的Metal@Silicalite‑1分子筛催化剂、原位制备方法及其在催化甲酸分解制备氢气及硝基苯择形性催化还原等反应中的应用，属于分子筛技术领域。该分子筛催化剂为纳米尺寸的六棱柱状形貌，六棱柱上下底面平均直径为100～200nm，厚度为50～100nm；分子筛催化剂中负载的超小贵金属粒子的分散度>85％，超小贵金属粒子为Pd、Pt或Au，粒径为0.6～1.8nm。所述分子筛催化剂，在甲酸分解反应中具有优异的催化性能，对不同尺寸的硝基苯类底物分子具有极高的催化选择性。同时，所述分子筛催化剂也可在用于各类加氢催化反应和选择性氧化反应以及电化学反应中。

摘要： 本实用新型涉及清洗装置技术领域，具体为一种METAL清洗台，包括清洗台、第一清洗桶与支撑杆；所述的清洗台上表面连接有第一清洗桶与支撑杆，所述的支撑杆上连接有连接杆，所述的连接杆上连接设置有延伸板，所述的延伸板上连接设置有清洁刷，所述的清洗台还包括储水箱与万向轮，所述的储水箱安装设置在所述的清洗台下表面，所述的万向轮安装设置在清洗台的腿部下端，本实用新型通过安装设置的第一清洗桶与第二清洗桶，当有不同大小的金属需要清洗时，可以将较小的放进第二清洗桶内清洗，这样第二清洗桶配有的清洁刷能够将大清洁刷无法清理到的部位清理干净。

摘要： 本实用新型提供一种Metal-Mesh导电膜的制造设备，包括：机架，用于固定微张力控制装置、黏胶装置和收纸传动装置，且包括用于放置Metal-Mesh导电膜的基板的工作台和包括滑轨的滑轨架；移动板，可移动地安装在滑轨上；微张力控制装置、黏胶装置和收纸传动装置固定在移动板上；且微张力控制装置用于通过微张力控制绝缘导电丝按照图案铺设在基板上；黏胶装置用于将胶带上的透明胶均匀涂抹在基板上；收纸传动装置用于收集透明胶被涂抹完毕的胶带。本实用新型降低了Metal-Mesh导电膜的生产成本，提高了生产效率、产品质量和成品的良品率，实现了导电膜的流水线生产。

摘要： 本发明公开了一种核壳结构Te@metal电氧化催化剂的制备方法。所述方法以硬模板Te为核，以贵金属Pt、Pd或其合金为壳，并加入聚乙烯吡咯烷酮，采用油浴加热方式制得具有核壳结构的Te@metal电氧化催化剂。本发明的Te@metal电氧化催化剂中贵金属含量较低，具有优异的醇类氧化性能，在液体燃料电池阳极氧化反应中的质量活性远超过商业Pt基催化剂，可以作为高效电催化剂应用在液体燃料电池领域。